Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Impact of Adjustments of Acquired Loans on Financial Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Details
Increase in accretable yield due to increased cash flow expectations	$ 5,202	$ 1,333	$ 10,598
Decrease in FDIC indemnification asset as a result of accretable yield increase	$ 0	$ 0	$ (2,744)